Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual chassi possui um motor Alfa Romeo flat-12.
 ###Tabelas: CREATE TABLE steam_locomotives (steam_locomotives_id AUTO_INCREMENT PRIMARY KEY, Identity VARCHAR, Builder VARCHAR, Built INT, Wheel Arrangement VARCHAR, Notes VARCHAR) CREATE TABLE week_5:_august_6_and_7_2008 (week_5:_august_6_and_7_2008_id AUTO_INCREMENT PRIMARY KEY, Main contestant VARCHAR, Co-contestant (Yaar vs. Pyaar) VARCHAR, Date performed VARCHAR, Scores by each individual judge VARCHAR, Total score/week VARCHAR, Position VARCHAR, Status VARCHAR) CREATE TABLE pga_tour_results (pga_tour_results_id AUTO_INCREMENT PRIMARY KEY, Year INT, Tournaments played INT, Cuts made INT, Wins INT, Best finish VARCHAR, Earnings ( $ ) INT, Money list rank VARCHAR) CREATE TABLE present_subjunctive (present_subjunctive_id AUTO_INCREMENT PRIMARY KEY, Verbs VARCHAR, Yo VARCHAR, Tú VARCHAR, Vos (*) VARCHAR, Él / Ella / Usted VARCHAR, Nosotros / Nosotras VARCHAR, Vosotros / Vosotras VARCHAR, Ellos / Ellas / Ustedes VARCHAR) CREATE TABLE complete_formula_one_world_championship_results (complete_formula_one_world_championship_results_id AUTO_INCREMENT PRIMARY KEY, Year INT, Entrant VARCHAR, Chassis VARCHAR, Engine VARCHAR, Points INT)  
SELECT Chassis FROM complete_formula_one_world_championship_results WHERE Engine = alfa romeo flat-12